Blackhearted is a term often used to describe someone who is cruel, malicious, or wicked. There are several synonyms for this word that can help to convey the same or similar meanings. Some of these synonyms include malevolent, callous, unfeeling, heartless, vicious, and depraved. Malevolent refers to someone who has a strong desire to harm others, while callous describes someone who is insensitive to the feelings of others. Heartless denotes a lack of empathy or compassion towards others, while vicious refers to someone who is inclined to commit acts of extreme violence. Finally, depraved refers to someone who has a twisted and corrupt moral compass.